EP3875677A1 - Câble de renfort élastomère - Google Patents

Câble de renfort élastomère Download PDF

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Publication number
EP3875677A1
EP3875677A1 EP19879404.2A EP19879404A EP3875677A1 EP 3875677 A1 EP3875677 A1 EP 3875677A1 EP 19879404 A EP19879404 A EP 19879404A EP 3875677 A1 EP3875677 A1 EP 3875677A1
Authority
EP
European Patent Office
Prior art keywords
strand
sheath
filaments
cord
polymer material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19879404.2A
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German (de)
English (en)
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EP3875677A4 (fr
Inventor
Nobuhiro Ando
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
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Bridgestone Corp
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Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of EP3875677A1 publication Critical patent/EP3875677A1/fr
Publication of EP3875677A4 publication Critical patent/EP3875677A4/fr
Pending legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • D07B1/165—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay
    • D07B1/167—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay having a predetermined shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite cords
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/48—Tyre cords
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D07B1/0626—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
    • B60C2009/0092—Twist structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C2009/2061—Physical properties or dimensions of the belt coating rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C2009/2074—Physical properties or dimension of the belt cord
    • B60C2009/2096—Twist structures
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2023—Strands with core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2036—Strands characterised by the use of different wires or filaments
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2041—Strands characterised by the materials used
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2046—Strands comprising fillers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2066—Cores characterised by the materials used
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2071—Spacers
    • D07B2201/2073—Spacers in circumferencial direction
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2075—Fillers
    • D07B2201/2082—Fillers characterised by the materials used
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D07B2205/2017—Polystyrenes
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/40—Machine components
    • D07B2207/404—Heat treating devices; Corresponding methods
    • D07B2207/4059—Heat treating devices; Corresponding methods to soften the filler material
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/202—Environmental resistance
    • D07B2401/2025—Environmental resistance avoiding corrosion
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/202—Environmental resistance
    • D07B2401/204—Moisture handling
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tire cords

Definitions

  • the present invention relates to an elastomer reinforcement cord (hereinafter, also simply referred to as "cord”). More particularly, the present invention relates to an elastomer reinforcement cord having a multi-strand structure which exhibits excellent adhesion with an elastomer.
  • steel cords obtained by twisting plural steel filaments together are used as reinforcing materials in belt cords and the like of a tire.
  • water and the like in the external environment may permeate into the gaps between the filaments constituting the steel cords and rust the steel cords. Accordingly, gaps are formed inside the steel cords to allow rubber to permeate into the steel cords at the time of vulcanization, whereby the water pathway is sealed.
  • Patent Document 1 proposes a composite cord obtained by twisting sheath wires each composed of 2 to 12 steel filaments around a core composed of resin filaments having a melting point of 50°C to lower than 200°C.
  • rusting of the steel filaments is inhibited by melting the resin filaments at the time of vulcanization to form appropriate gaps between the steel filaments and allowing rubber to permeate into the thus formed gaps.
  • Patent Document 1 it is known to inhibit rusting of a cord composed of metal filaments by using resin filaments in combination.
  • a multi-strand cord having a complex structure that includes a greater number of metal filaments was not examined, and a technology for further improvement of the rust resistance has been demanded for multi-strand cords as well.
  • an object of the present invention is to provide an elastomer reinforcement cord which has a multi-strand structure including plural metal filaments and exhibits an improved rust resistance.
  • the present inventor intensively studied to discover that the above-described problems can be solved by defining a polymer material originated from resin filaments to have a prescribed filling rate inside a cord that has a multi-strand structure including metal filaments, thereby completing the present invention.
  • the elastomer reinforcement cord of the present invention is an elastomer reinforcement cord including metal filaments and a polymer material
  • the polymer material In the cord of the present invention, it is preferred that the polymer material have a melting point or softening point of 80°C to 160°C. In the cord of the present invention, it is also preferred that the polymer material have a melt flow rate, which is defined by JIS K7210, of 1.0 g/10 min or higher.
  • a distance between the outermost-layer metal filaments of the sheath strands be 20 ⁇ m or less.
  • the core strand and the sheath strands each have a layer-strand structure including a core and at least one sheath layer, and the core be formed by twisting three metal filaments together.
  • the elastomer reinforcement cord of the present invention can be formed by twisting the metal filaments with resin filaments including the polymer material.
  • an elastomer reinforcement cord which has a multi-strand structure including plural metal filaments and exhibits an improved rust resistance can be realized.
  • FIG. 1 shows a cross-sectional view of an elastomer reinforcement cord according to one preferred embodiment of the present invention in a direction orthogonal to the axial direction before vulcanization.
  • an elastomer reinforcement cord 10 of the present invention is formed by twisting metal filaments 1a, 1b, 11a and 11b with resin filaments 2a, 2b, 12a and 12b composed of a polymer material.
  • FIG. 2 shows a cross-sectional view of the elastomer reinforcement cord shown in FIG. 1 in a direction orthogonal to the axial direction after vulcanization.
  • the elastomer reinforcement cord 10 of the present invention has a multi-strand structure including: at least one core strand 21 formed by twisting plural metal filaments 1a and 1b together; and two or more sheath strands 22 each formed by twisting plural metal filaments 11a and 11b together, the sheath strands 22 being twisted together around the core strand 21.
  • the illustrated elastomer reinforcement cord 10 includes: a single core strand 21 having a core 21A composed of three metal filaments 1a, and a single sheath layer 21B composed of nine metal filaments 1b; and six sheath strands 22, each having a core 22A composed of three metal filaments 11a, and a single sheath layer 22B composed of nine metal filaments 11b.
  • the structure of the cord of the present invention is not restricted to the above-described structure.
  • FIG. 3 shows an enlarged view of one sheath strand 22 extracted from FIG. 2 .
  • a region that is surrounded by a line connecting the centers of the outermost-layer metal filaments of the respective sheath strands 22 (a line connecting the centers of the metal filaments 11b constituting the sheath layer 22B in the illustrated example) and occupied by other than the metal filaments 11a and 11b is defined as an intra-sheath-strand gap region A.
  • an intra-sheath-strand filling rate a which is a ratio of the area of a polymer material 3 originated from the resin filaments with respect to the intra-sheath-strand gap region A, is 52% or higher.
  • an inter-strand gap region B a region between the outermost-layer metal filaments of the core strand 21 (the metal filaments 1b constituting the sheath layer 21B in the illustrated example) and the outermost-layer metal filaments of the sheath strands 22 (the metal filaments 11b constituting the sheath layers 22B in the illustrated example) is defined as an inter-strand gap region B.
  • an inter-strand filling rate b which is a ratio of the area of the polymer material 3 originated from the resin filaments with respect to the inter-strand gap region B, is 75% or higher.
  • the filling ratios of the polymer material 3 in the regions occupied by other than the metal filaments in each sheath strand 22 and between the core strand 21 and the sheath strands 22 as the intra-sheath-strand filling rate a and the inter-strand filling rate b in the above-described manner, respectively, good rust resistance can be ensured even when the cord 10 has a multi-strand structure.
  • the intra-sheath-strand filling rate a is 52% or higher and the inter-strand filling rate b is 75% or higher, sufficient rust resistance is obtained since the gaps in the cord are sufficiently filled with the polymer material 3.
  • an intra-sheath-strand filling rate a of higher than 100% means that even the outer side of each intra-sheath-strand gap region A is filled with the polymer material 3, i.e. those parts of the surfaces of the outermost-layer metal filaments 11b of each sheath strand 22 that correspond to the cord outer periphery are covered with the polymer material 3.
  • the intra-sheath-strand filling rate a is required to be 52% or higher, and it is preferably 80% or higher, but preferably 130% or lower, more preferably 125% or lower.
  • the inter-strand filling rate b is required to be 75% or higher, and it is preferably 80% or higher, but preferably 110% or lower. It is noted here that, in the present invention, the intra-sheath-strand filling rate a is determined as an average value of at least two sheath strands.
  • the filling ratio of the polymer material 3 with respect to the gap region in the core strand 21 is not particularly restricted; however, it has been confirmed by the present inventor that, when the above-described conditions of the intra-sheath-strand filling rate a and the inter-strand filling rate b are satisfied, the polymer material 3 is also filled into the gap region in the core strand 21 at a rate of substantially 100%.
  • a distance w between the outermost-layer metal filaments 11b of the respective sheath strands 22 after vulcanization is preferably 100 ⁇ m or less.
  • the area in which the polymer material 3 originated from the resin filaments comes in contact with an elastomer such as rubber after vulcanization can be reduced.
  • the distance w between the metal filaments 11b constituting the outermost sheath layer is preferably 20 ⁇ m or less.
  • voids on the adjacent observed cross-sections be not in communication with each other at three or more spots.
  • the void acts as a water pathway and rust is developed on the metal filaments 11a and 11b.
  • closed systems are formed in the intra-sheath-strand gap region A, so that rust development along the axial direction can be effectively inhibited.
  • metal wires containing steel namely iron, as a main component (the mass of the iron is greater than 50% by mass with respect to a total mass of the metal filaments) can be used.
  • the metal filaments 1a, 1b, 11a and 11b may consist of only iron, or may contain a metal other than iron, such as zinc, copper, aluminum, or tin. Particularly, steel filaments are used.
  • the surfaces of the metal filaments 1a, 1b, 11a and 11b may be treated by plating.
  • the type of the plating is not particularly restricted, and examples thereof include zinc plating, copper plating, brass plating, bronze plating, and ternary alloy plating such as copper-zinc-cobalt plating.
  • brass plating composed of copper and zinc is preferred since brass-plated metal filaments exhibit excellent adhesion with rubber.
  • the ratio of copper and zinc (copper:zinc) is usually 60:40 to 70:30 based on mass.
  • the thickness of the resulting plated layer is generally 100 nm to 300 nm.
  • the diameter, the tensile strength, and the cross-sectional shape of the metal filaments 1a, 1b, 11a and 11b are not particularly restricted, and may be appropriately selected as desired.
  • the diameter of the metal filaments 1a, 1b, 11a and 11b may be 0.10 mm to 0.60 mm, and it is preferably 0.12 mm to 0.50 mm.
  • the melting point when a resin component contained therein is composed of a single resin, or the softening point when the resin component is composed of a composition containing two or more resins is preferably 80°C to 160°C, more preferably 130°C to 160°C.
  • melting point refers to a melting peak temperature determined by the heat flux differential scanning calorimetry prescribed in JIS K7121.
  • softening point used herein refers to a value measured by the softening point test method prescribed in JIS K7206 (1999).
  • the polymer material 3 it is preferred to use a polymer material having a melt flow rate (MFR), which is defined by JIS K7210, of 1.0 g/10 min or higher.
  • MFR melt flow rate
  • the use of a polymer material having an MFR of 1.0 g/10 min or higher as the polymer material 3 is preferred since, when the resin filaments 2a, 2b, 12a and 12b are melted or softened during vulcanization, the polymer material 3 inside the cord can be ensured to have sufficient fluidity and is thus sufficiently filled into the gaps between the metal filaments constituting the cord.
  • the MFR of the polymer material is more preferably 5.0 g/10 min or higher but, for example, 20 g/10 min or lower.
  • an ionomer or an acid-modified resin can be used, or any combination thereof may be used as well.
  • acid-modified resins a resin modified with an acid anhydride of dimer acid, maleic acid, itaconic acid or the like is preferred. By using a maleic acid-modified resin, the adhesion of the polymer material 3 with the metal filaments can be improved.
  • maleic acid-modified resin examples include maleic anhydride-modified styrene-ethylene-butadiene-styrene block copolymers (SEBS), maleic acid-modified polyethylenes, maleic anhydride-modified ultralow-density polyethylenes, maleic anhydride-modified ethylene-butene-1 copolymers, maleic anhydride-modified ethylene-propylene copolymers, maleic anhydride-modified ethylene-octene, and maleic anhydride-modified propylene, among which a maleic anhydride-modified SEBS is particularly preferred.
  • SEBS maleic anhydride-modified styrene-ethylene-butadiene-styrene block copolymers
  • TUFTEC M1943, M1911 and M1913 which are manufactured by Asahi Kasei Corporation, as well as ADMER LB548, NF518, QF551, QF500 and QE060, HI-WAX 4051E, 4252E and 1105A, and TAFMER MH7010 and MH7020, which are manufactured by Mitsui Chemicals, Inc. These may be used singly, or in combination of two or more thereof.
  • the resin component of the polymer material 3 preferably contains an ionomer.
  • an ionomer By incorporating an ionomer into the polymer material 3, the surfaces of the resin filaments 2a, 2b, 12a and 12b are smoothened, so that not only the spinnability can be improved but also the lubricity of the resin filaments in a twisting machine can be improved.
  • the mass ratio of the acid-modified resin and the ionomer is preferably in a range of 1:9 to 9:1 and, taking into consideration the balance of various performance, it is more preferably in a range of 4:6 to 6:4.
  • the ionomer examples include: zinc ion-neutralized ionomers, such as HIMILAN 1554, HIMILAN 1557, HIMILAN 1650, HIMILAN 1652, HIMILAN 1702, HIMILAN 1706 and HIMILAN 1855, as well as sodium ion-neutralized ionomers, such as HIMILAN 1555, HIMILAN 1601, HIMILAN 1605, HIMILAN 1707, HIMILAN 1856 and AM7331, all of which are manufactured by Dow-Mitsui Polychemicals Co., Ltd.; and lithium ion-neutralized ionomers such as SURLYN 7930, and sodium ion-neutralized ionomers such as SURLYN 8120, which are manufactured by DuPont Co., Ltd. These ionomers may be used singly, or in combination of two or more thereof.
  • Examples of the resin component of the polymer material 3 further include: "NUCREL” Series and “ELVALOY” Series, which are manufactured by Dow-Mitsui Polychemicals Co., Ltd.; “MODIC” Series manufactured by Mitsubishi Chemical Corporation; “OREVAC” Series, “BONDINE” Series, and “LOTRYL” Series, which are manufactured by Arkema K.K.; “REXPEARL” Series manufactured by Japan Polyethylene Corporation; “ACRYFT” Series manufactured by Sumitomo Chemical Co., Ltd.; fluorine-based ionomers manufactured by Asahi Kasei Corporation; and ethylene-ethyl acrylate copolymers manufactured by NUC Corporation. These resin components may be used singly, or in combination of two or more thereof.
  • the polymer material 3 may also contain an inorganic filler.
  • the melting point or softening point thereof is preferably 160°C or lower.
  • the strength of the resin filaments 2a, 2b, 12a and 12b is reduced and, therefore, the resin filaments may be broken during twisting, which deteriorates the productivity. Accordingly, in the cord 10 of the present invention, the strength of the resin filaments 2a, 2b, 12a and 12b may be improved by adding an inorganic filler to the polymer material 3.
  • the surface tackiness of the resin filaments 2a, 2b, 12a and 12b is reduced, so that the lubricity of the resin filaments 2a, 2b, 12a and 12b is further improved, which makes twisting of the cord easier.
  • the amount of the inorganic filler to be added is preferably 0.1 parts by mass to 30 parts by mass, more preferably 0.5 parts by mass to 30 parts by mass, still more preferably 5 parts by mass to 30 parts by mass, particularly preferably 10 parts by mass to 20 parts by mass, with respect to 100 parts by mass of the resin component contained in the polymer material 3.
  • the amount of the inorganic filler is 0.1 parts by mass or larger with respect to 100 parts by mass of the resin component, the effect of reinforcing the resin filaments 2a, 2b, 12a and 12b is sufficiently obtained.
  • the amount of the inorganic filler to be 30 parts by mass or less, not only saturation of the effect of reinforcing the resin filaments 2a, 2b, 12a and 12b is inhibited, which is preferred from the cost standpoint as well, but also sufficient dispersibility of the inorganic filler can be ensured and the durability of the resin filaments 2a, 2b, 12a and 12b can be improved at the same time.
  • the inorganic filler examples include carbon black, silica, aluminum hydroxide, clay, alumina, talc, mica, kaolin, glass balloons, glass beads, calcium carbonate, magnesium carbonate, magnesium hydroxide, magnesium oxide, titanium oxide, potassium titanate, and barium sulfate. These inorganic fillers may be used singly, or in combination of two or more thereof. Thereamong, carbon black is preferred from the standpoint of reinforcing the resin filaments 2a, 2b, 12a and 12b. It is noted here that rubber compositions constituting tires usually contain carbon black.
  • the use of carbon black in the resin filaments 2a, 2b, 12a and 12b according to the cord 10 of the present invention improves the compatibility between the resin filaments 2a, 2b, 12a and 12b and a rubber composition constituting the tire; therefore, the adhesion between rubber and the polymer material is expected to be improved as well.
  • the grade thereof is not particularly restricted, and any carbon black may be selected as appropriate.
  • examples thereof include SRF, GPF, FEF, HAF, ISAF, and SAF.
  • FEF, HAF, ISAF and SAF which have excellent bending resistance and fracture resistance, can be preferably used, and the carbon black has a nitrogen adsorption specific surface area N 2 SA (according to JIS K6217-2:2001) of preferably 30 to 150 m 2 /g, more preferably 35 to 130 m 2 /g.
  • the polymer material 3 may also contain a thermoplastic resin and/or a thermoplastic elastomer to such an extent that does not hinder the effects of the present invention. Further, a variety of additives, such as an age resistor, an oil, a plasticizer, a color former, and a weather resistant agent, may be incorporated (blended) into the polymer material 3.
  • a variety of additives such as an age resistor, an oil, a plasticizer, a color former, and a weather resistant agent, may be incorporated (blended) into the polymer material 3.
  • the resin filaments 2a, 2b, 12a and 12b can be produced by a known method using the polymer material 3, and the production method is not particularly restricted.
  • the resin filaments 2a, 2b, 12a and 12b can be produced by kneading the resin component and the like constituting the polymer material 3, and subsequently drawing the resulting resin composition.
  • an inorganic filler is added to the polymer material 3
  • a large amount of the inorganic filler is added to the resin component to produce a masterbatch in advance, and the resin filaments 2a, 2b, 12a and 12b can be produced by adding this masterbatch to the resin component to prepare a resin composition containing the inorganic filler in a prescribed amount, and subsequently drawing the thus obtained resin composition.
  • the resin filaments 2a, 2b, 12a and 12b preferably have a diameter of 0.1 mm or larger.
  • the diameter of the resin filaments 2a, 2b, 12a and 12b By controlling the diameter of the resin filaments 2a, 2b, 12a and 12b to be 0.1 mm or larger, the resin filaments 2a, 2b, 12a and 12b are made unlikely to be broken when twisted together with the metal filaments 1a, 1b, 11a and 11b, and this makes it easier to produce a cord having a desired structure.
  • An upper limit of the diameter of the resin filaments 2a, 2b, 12a and 12b is not particularly restricted, and can be set as appropriate such that the conditions of the intra-sheath-strand filling rate a and the inter-strand filling rate b after vulcanization are satisfied.
  • the structure of the cord 10 of the present invention is not particularly restricted as long as the cord 10 of the present invention has a multi-strand structure including at least one core strand 21 and two or more sheath strands 22 and in which the sheath strands 22 are twisted together around the core strand 21.
  • the cord 10 of the present invention may have specifically, for example, a multi-strand structure in which core strand and sheath strands each having an (N + M) structure of (1 + 6), (2 + 6), (2 + 8), (3 + 8), (3 + 9) or the like, an (N + M + L) structure of (3 + 9 + 15), (1 + 6 + 11) or the like, or a compact structure of (1 + 6), (2 + 8), (3 + 9), (1 + 6 + 12) or the like, are further twisted together after vulcanization.
  • the metal filaments constituting the respective strands may have the same diameter or different diameters
  • the core strand and the sheath strands may have the same structure or different structures.
  • a cord whose strands each have a layer-strand structure constituted by a core and at least one sheath layer and in which the core of each strand is formed by twisting three metal filaments together have a structure that is unlikely to allow an elastomer to permeate into the voids inside the core; however, in the present invention, by arranging the resin filaments 2a and 12a in the core as illustrated in FIG. 1 , the void in the center of the core can be easily filled with the polymer material 3 after vulcanization. Therefore, the application of the present invention is particularly useful for such a cord having a structure in which the cores of the core strand and the sheath strands are each formed by twisting three metal filaments together.
  • the cord 10 of the present invention can be obtained by twisting the metal filaments 1a, 1b, 11a and 11b with the resin filaments 2a, 2b, 12a and 12b, subsequently bringing the resin filaments 2a, 2b, 12a and 12b into a flowable state by heating, and then filling the gaps between the metal filaments 1a, 1b, 11a and 11b with the polymer material 3.
  • the arrangement positions of the resin filaments at the time of twisting the metal filaments with the resin filaments there is no particular restriction as long as the gaps between the metal filaments can be appropriately filled with the polymer material by heating and the conditions of the intra-sheath-strand filling rate a and the inter-strand filling rate b after vulcanization are satisfied.
  • the cord 10 of the present invention can be produced by twisting the resin filaments 2a, 2b, 12a and 12b together simultaneously with ordinary cord twisting, using a twisting machine or the like that is generally used for the production of a tire steel cord. Therefore, there is no increase in the operation steps, and the productivity is not deteriorated. From the standpoint of inhibiting twist breakage caused by different materials of the metal filaments 1a, 1b, 11a and 11b and the resin filaments 2a, 2b, 12a and 12b, it is preferred to use a resin material having the highest strength possible for the resin filaments 2a, 2b, 12a and 12b.
  • the resin material has a Rockwell hardness (H scale) of 30 to 150.
  • H scale Rockwell hardness
  • the strength of the resin filaments 2a, 2b, 12a and 12b can be improved by increasing the draw ratio in the production of the resin filaments 2a, 2b, 12a and 12b.
  • the resin filaments 2a, 2b, 12a and 12b preferably have good lubricity in a twisting machine.
  • the cord 10 of the present invention exhibits excellent adhesion with an elastomer such as rubber and, therefore, can be preferably used in those parts where a steel cord-rubber complex is conventionally used.
  • the cord 10 of the present invention can be preferably used as a reinforcing material of a rubber article, such as a tire, a belt, or a hose.
  • Specific examples of the tire include tires of passenger vehicles, and tires for trucks and buses.
  • a part to which the cord 10 of the present invention is applied is also not particularly restricted, and the cord 10 of the present invention can be used as a carcass ply reinforcing material or a belt reinforcing material. In this case, the cord 10 of the present invention can be used only for local reinforcement of a portion of a tread.
  • the cord 10 of the present invention can also be used only for local reinforcement of, for example, the vicinity of a tread end, the vicinity of the equatorial plane, the vicinity of groove bottom or, when other inclined belt layer or a circumferential cord layer is included, an end thereof.
  • the elastomer used for covering the cord 10 of the present invention is also not particularly restricted and, for example, any rubber that is conventionally used for coating a metal cord can be used.
  • examples of an elastomer that can be preferably used include: diene-based rubbers and hydrogenation products thereof, such as natural rubbers (NR), isoprene rubbers (IR), epoxidized natural rubbers, styrene-butadiene rubbers (SBR), butadiene rubbers (BR, high-cis BR and low-cis BR), nitrile rubbers (NBR), hydrogenated NBRs, and hydrogenated SBRs; olefin-based rubbers, such as ethylene-propylene rubbers (EPDM and EPM), maleic acid-modified ethylene-propylene rubbers (M-EPM), butyl rubbers (IIR), copolymers of isobutylene and an aromatic vinyl or diene monomer, acrylic rubbers (ACM), and ionomers
  • An intermediate wire material of 1.86 mm in diameter was produced by drawing and patenting a piano wire rod having a diameter of 5.5 mm and a carbon content of 0.82% by mass, and this intermediate wire material was plated with copper and zinc and subsequently subjected to thermal diffusion to prepare a brass-plated intermediate wire material, which was drawn again to obtain steel filaments having various diameters.
  • a polymer material softening point: 110°C
  • TUFTEC M1943 manufactured by Asahi Kasei Corporation (softening point: 39°C, MFR: 8 g/min (JIS K7210)
  • HIMILAN 1702 manufactured by Dow-Mitsui Polychemicals Co., Ltd.
  • strands having a (3 + 9) structure in their steel parts were prepared using the above-obtained steel filaments and resin filaments, and the thus obtained strands were each used as a core strand or a sheath strand to obtain an unvulcanized cord of Example 1 having a multi-strand structure in which six sheath strands were twisted together around a single core strand.
  • the diameter of the resin filaments was selected in accordance with the conditions shown in Table below.
  • an unvulcanized cord of Comparative Example 1 was produced in the same manner in accordance with the strand structure shown below.
  • unvulcanized cords of Comparative Example 2 and Examples 2 to 4 were produced by modifying the diameter of the resin filaments in the cord structure of Example 1 such that the respective conditions shown in Table below were satisfied.
  • Comparative Example 3 and Example 5 predictive values of the same evaluation items as in Example 1 and the like are determined for the cords having a structure conforming to the respective conditions shown in Table below. 1 r 1 + 3 + 3 r 2 + 9 ⁇ 0.34 mm + 6 ⁇ 1 r 3 + 3 + 3 r 4 + 9 ⁇ 0.34 mm 1 r 1 + 3 + 3 r 2 + 9 ⁇ 0.34 mm 7 ⁇ 3 + 9 ⁇ 0.34 mm
  • the cord of Example 1 was constituted by: a single core strand having a layer-strand structure (3 + 9 structure) in which three steel filaments and three resin filaments (r 2 ) constituting a core, and nine steel filaments constituting a sheath layer were arranged and twisted together around a single resin filament (r 1 ); and six sheath strands each having a layer-strand structure (3 + 9 structure) in which three steel filaments and three resin filaments (r 4 ) constituting a core, and nine steel filaments constituting a sheath layer were arranged and twisted together around a single resin filament (r 3 ) (see FIG. 1 ).
  • the cord of Conventional Example 1 had a layer-strand structure (3 + 9 structure) in which three steel filaments and three resin filaments (r 2 ) constituting a core, and nine steel filaments constituting a sheath layer were arranged and twisted together around a single resin filament (r 1 ).
  • the cord of Comparative Example 1 had a multi-strand structure in which seven strands were twisted together, the strands each having a layer-strand structure (3 + 9 structure) in which nine steel filaments constituting a sheath layer were arranged and twisted together around three steel filaments constituting a core.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
EP19879404.2A 2018-10-30 2019-10-29 Câble de renfort élastomère Pending EP3875677A4 (fr)

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JP2018204360A JP7278745B2 (ja) 2018-10-30 2018-10-30 エラストマー補強用コード
PCT/JP2019/042418 WO2020090833A1 (fr) 2018-10-30 2019-10-29 Câble de renfort élastomère

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CN111978647B (zh) * 2020-08-18 2023-03-07 长缆电工科技股份有限公司 改性三元乙丙橡胶材料的制备方法及应用

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WO2011116493A1 (fr) * 2010-03-23 2011-09-29 Nv Bekaert Sa Câblé ouvert, avec filaments préformés, pour service hors-route
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WO2011116493A1 (fr) * 2010-03-23 2011-09-29 Nv Bekaert Sa Câblé ouvert, avec filaments préformés, pour service hors-route
JP2015203157A (ja) * 2014-04-10 2015-11-16 株式会社ブリヂストン ゴム物品補強コード用金属フィラメントおよびゴム物品補強コード
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US20210379931A1 (en) 2021-12-09
JP2020070511A (ja) 2020-05-07
JP7278745B2 (ja) 2023-05-22
EP3875677A4 (fr) 2022-08-31
WO2020090833A1 (fr) 2020-05-07

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